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Problem

When animating a web application, the SOLO web server that is provided with Net Express fails with the following error:

SOLO - Fatal Error initializing
Attempt to bind address failed

This problem actually occurs when a web server, such as Microsoft IIS, is actually running and using port 80 on the same machine, and this causes a conflict with SOLO that is also using port 80 by default.

Resolution

Here are the steps to change the port number to be used by SOLO:

  1. Open the Net Express IDE
  2. Click on Options > Project
  3. Change the number 80 in the "Port address for WebServer" field to a different one, e.g. 8080